Merge pull request #964 from simbilod/terminator

waveguide termination component

gdsfactory/components/taper_cross_section.py

@@ -72,6 +72,6 @@ def taper_cross_section(
     # x2 = gf.partial(rib, width=2.5)
     # c = taper_cross_section_linear(x1, x2)
 
-    # c = taper_cross_section()
-    c = taper_cross_section_sine()
+    c = taper_cross_section(gf.cross_section.strip, gf.cross_section.rib)
+    # c = taper_cross_section_sine()
     c.show(show_ports=True)

gdsfactory/components/terminator.py

@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+from typing import List, Optional
+
+import gdsfactory as gf
+from gdsfactory.component import Component
+from gdsfactory.components.taper_cross_section import taper_cross_section
+from gdsfactory.cross_section import CrossSection, strip
+from gdsfactory.types import LayerSpec
+
+
+@gf.cell
+def terminator(
+    length: Optional[float] = 50,
+    input_xs: Optional[CrossSection] = strip,
+    tapered_xs: Optional[CrossSection] = None,
+    tapered_width: float = 2.0,
+    doping_layers: List[LayerSpec] = ["NPP"],
+    **kwargs,
+) -> gf.Component:
+    """Doped narrow taper to terminate waveguides.
+
+    Args:
+        length: distance between input and narrow tapered end.
+        input_xs: input cross-section.
+        tapered_xs: cross-section at the end of the termination (by default, input_xs with width 200 nm)
+        tapered_width: width of the default cross-section at the end of the termination (by default, 200 nm). Only used if tapered_xs is not None
+        doping_layers: doping layers to superimpose on the taper. Default N++.
+        **kwargs: taper_cross_section arguments
+    """
+    c = Component()
+
+    tapered_xs = tapered_xs if tapered_xs else gf.partial(input_xs, width=tapered_width)
+
+    taper = c << gf.get_component(
+        taper_cross_section,
+        length=length,
+        cross_section1=input_xs,
+        cross_section2=tapered_xs,
+        **kwargs,
+    )
+
+    for layer in doping_layers:
+        c << gf.components.bbox(bbox=taper.bbox, layer=layer)
+
+    c.add_port(name="o1", port=taper.ports["o1"])
+
+    return c
+
+
+if __name__ == "__main__":
+
+    c = terminator()
+    c.show(show_ports=True)